How can I evaluate the following improper integral:
$$ \int\limits_0^{\infty}\frac{\sin x}{x}\, dx$$
I have tried to evaluate this by integration by parts but failed. Please help
I have injection $f \colon A \rightarrow B$ and I want to get bijection. Can I just resting codomain to $f(A)$? I know that every function i...
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